3.15% is the change from 667 to 688
Calculation steps:
[( 688 - 667 ) ÷ 667] x 100 = 3.15%
Formula
Percentage change = [(688 - 667) / 667] x 100
Subtract the new number by the original number
688 - 667 = 21
21 ÷ 667 = 0.031484257871064465
0.031484257871064465 x 100 = 3.15%